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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Laser amplifier with the feedback loop as self-pumped phase conjugator of the light beam

Oleg L. Antipov, Sergey I. Belyaev, Alexander S. Kuzhelev

Published Apr 11, 1996• 0 citations
Publisher

Abstract

Self-pumped phase conjugation of the light beam in an inverted Nd:YAG-crystal with the different schemes of the feedback loop has been studied experimentally and theoretically. The quality of the phase conjugation of space heterogeneous beam, and the vibrational resistance for different polarizations of the input beam were investigated. The thresholds of parametric generation of the phase conjugated beam in the inverted media with real and imaginary parts of the nonlinear susceptibility are discussed.

DOI
10.1117/12.238078

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Journal of the Optical Society of America B•Aug 1, 1996•4 citations
Self-pumped phase conjugation of the light beam in an inverted Nd:YAG-crystal with the different schemes of the feedback loop has been studied experimentally and theoretically. The quality of the phase conjugation of space heterogeneous beam, and the vibrational resistance for different polarizations of the input beam were investigated. The thresholds of parametric generation of the phase conjugated beam in the inverted media with real and imaginary parts of the nonlinear susceptibility are discussed.
The effect of self-pumped phase conjugation (SPPC) of the light beam in the inverted laser crystal (LC) with the feedback loop was investigated in recent years. The possibility of SPPC in the reciprocal loop scheme is concerned with the refractive index grating which occurs due to difference of polarizability of the Nd ions in the metastable and the ground states [1]. The high efficiency of multipass geometry in the phase conjugation systems based on the laser crystals have been demonstrated for the degenerate four-wave mixing processes [2].
It is well known that inverted laser crystals have a strong inertial optical nonlinearity that is connected with changing of susceptibility by saturation of laser transition. The phase conjugation (PC) of laser beams by parametric oscillation in resonator with holographic mirror induced by means of mutually-coherent pumping waves in an inverted laser crystal was discussed.1,2 In our work, the phase conjugation of laser beams in loop scheme with an inverted Nd:YAG-rod (where two near-counter-running light beams with orthogonal polarization intersected) was investigated.
We have studied both experimentally and numerically the role of resonant refractive index gratings in a self-pumped phase conjugate mirror based on an Nd:YAG amplifier with nonreciprocal feedback loop. In experiment the generation of the phase-conjugating laser was delayed with respect to recording of a holographic nonlinear mirror by an external beam. An increase in the phase-conjugate reflectivity at a delay time of about 3 microseconds was measured. The numerical calculation confirmed the additional contribution of the resonant refractive-index grating, which is formed in the pumped Nd:YAG crystal due to excitation of a higher-lying level of Nd3+ ions, to efficiency of phase conjugation.
An experimental study of double-pumped phase conjugation (DPPC) in a gain medium (Nd:YAG) is presented. The input–output energy and phase conjugate reflectivity of the system was experimentally characterized, with a maximum reflectivity of R∼160 observed. A self-starting DPPC laser was also produced by use of a feedback mirror, and spatial and temporal outputs are presented. The DPPC laser produced a TEM00 spatial mode output of 113 mJ in a 20-ns single-longitudinal mode pulse at a repetition rate of 10 Hz.